It still doesn't really address the issue they brought up, which is the entire planet running out of water. Personally, I don't even know how that's possible since moisture has to go somewhere, doesn't just disappear. As long as we are able to tap the source in which it goes to (atmosphere, oceans, wells), I don't see how we will run out of water entirely as a planet.

As long as we have an atmosphere, we'll have about the same amount of water we have now...

If we don't have an atmosphere, well then we won't need to worry about drinking.